openbao-monitor: align the log levels with helm chart

The helm chart uses numeric values representing the following log
levels: DEBUG, INFO, WARNING, ERROR and FATAL

Update the validation to accept numeric levels, and interpet 5 (FATAL)
as ERROR.

Test Plan:
PASS  test valid/invalid loglevels, numeric bounds

Change-Id: Ifbebe30e487f30ba11ada398056252e80a07ba94
Signed-off-by: Michel Thebeau <Michel.Thebeau@windriver.com>

security/openbao-monitor/source/commands/root.go

@@ -60,11 +60,7 @@ func setupCmd(cmd *cobra.Command, args []string) error {
 
 	// Set default configuration for logs if no custum configs are given
 	logFile := globalConfig.LogPath
-	logLevel := globalConfig.LogLevel
-	if logLevel == "" {
-		// Default log level if no log level was set
-		logLevel = "INFO"
-	}
+	logLevel := globalConfig.InterpretLogLevel()
 
 	// Set default to stderr if no log file was specified.
 	logWriter = os.Stderr

security/openbao-monitor/source/config/config.go

@@ -65,6 +65,7 @@ type MonitorConfig struct {
 
 	// The default log level
 	// Available log levels: DEBUG, INFO, WARN and ERROR
+	// Accepts numeric values matching helm chart log levels (4-5 are interpreted as ERROR)
 	LogLevel string `yaml:"logLevel"`
 
 	// The time in seconds waited between each unseal check in the run command.
@@ -295,3 +296,26 @@ func (configInstance *MonitorConfig) ParseInitResponse(dnshost string, responce
 	slog.Debug("Parsing init response complete")
 	return nil
 }
+
+// Interpret numeric or text log level
+// Always returns a log level in string format
+func (configInstance *MonitorConfig) InterpretLogLevel() string {
+	// Check if the log level is a number
+	if converted, err := strconv.Atoi(configInstance.LogLevel); err == nil {
+		if level, exists := availableLogLevels[converted]; exists {
+			return level
+		}
+
+		// error, but this code should not be reached if validateLogConfig works
+		fmt.Errorf("the numeric LogLevel %v is not a valid log level", configInstance.LogLevel)
+		return "INFO" // Default to INFO if the numeric level is invalid
+	}
+
+	// Default to INFO if no log level was set
+	if configInstance.LogLevel == "" {
+		return "INFO"
+	}
+
+	// validateLogConfig already validated the LogLevel
+	return configInstance.LogLevel
+}

security/openbao-monitor/source/config/validate.go

@@ -6,9 +6,18 @@ import (
 	"os"
 	"path"
 	"regexp"
-	"slices"
+	"strconv"
 )
 
+// Available log levels; these should match the levels available in helm chart
+var availableLogLevels = map[int]string{
+		1: "DEBUG",
+		2: "INFO",
+		3: "WARN",
+		4: "ERROR",
+		5: "ERROR",
+}
+
 func (configInstance MonitorConfig) validateDNS() error {
 	for domain_name, url := range configInstance.ServerAddresses {
 		// If Host is empty, then the domain entry is invalid
@@ -63,6 +72,8 @@ func (configInstance MonitorConfig) validateKeyShards() error {
 }
 
 func (configInstance MonitorConfig) validateLogConfig() error {
+	var found bool = false
+
 	if configInstance.LogPath != "" {
 		_, err := os.Stat(path.Dir(configInstance.LogPath))
 		if err != nil {
@@ -71,10 +82,27 @@ func (configInstance MonitorConfig) validateLogConfig() error {
 		}
 	}
 	if configInstance.LogLevel != "" {
-		availableLogLevels := []string{"DEBUG", "INFO", "WARN", "ERROR"}
-		if !slices.Contains(availableLogLevels, configInstance.LogLevel) {
-			return fmt.Errorf(
-				"the listed LogLevel %v is not a valid log level", configInstance.LogLevel)
+		if converted, err := strconv.Atoi(configInstance.LogLevel); err == nil {
+			// convert the numeric log level to string
+			if _, exists := availableLogLevels[converted]; exists {
+				// pass, Accept the numeric LogLevel
+			} else {
+				return fmt.Errorf(
+					"the numeric LogLevel %v is not a valid log level", configInstance.LogLevel)
+			}
+		} else {
+			// Check if the LogLevel is one of the available log levels
+			for _, value := range availableLogLevels {
+				if value == configInstance.LogLevel {
+					// Accept LogLevel
+					found = true
+					break
+				}
+			}
+			if !found {
+				return fmt.Errorf(
+					"the listed LogLevel %v is not a valid log level", configInstance.LogLevel)
+			}
 		}
 	}